74ACT2708 datasheet(4/13 Pages) FAIRCHILD

Part #	74ACT2708

Description	64 x 9 First-In, First-Out Memory

Download	13 Pages

Scroll/Zoom	100%

Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

Logo

4 / 13 page

www.fairchildsemi.com

4

MODES OF OPERATION

Mode 1: Shift in Sequence for FIFO Empty to Full

Sequence of Operation

1. Input Ready is initially HIGH; HF and FULL flags are

LOW. The FIFO is empty and prepared for valid data.

OR is LOW indicating that the FIFO is not yet ready to

output data.

2. Shift-In is set HIGH, and data is loaded into the FIFO.

Data has to be settled ts before the falling edge of SI

and held th after.

3. Input Ready (IR) goes LOW propagation delay tIR after

SI goes HIGH: input stage is busy.

4. Shift-In is set LOW; IR goes HIGH indicating the FIFO

is ready for additional data. Data just shifted-in arrives

at output propagation delay tOD5 after SI falls. OR goes

HIGH propagation delay tIOR after SI goes LOW, indi-

cating the FIFO has valid data on its outputs. HF goes

HIGH propagation delay tIEafter SI falls, indicating the

FIFO is no longer empty.

5. The process is repeated through the 64th data word.

On the rising edge of the 33rd SI, FULL flag goes HIGH

propagation delay tIHF after SI, indicating a half-full

FIFO. HF goes LOW propagation delay tIF after the ris-

ing edge of the 64th pulse indicating that the FIFO is

full. Any further shift-ins are disabled.

Note: SO and OE are LOW; MR is HIGH.

FIGURE 1. Modes of Operation Mode 1

Similar Part No. - 74ACT2708

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	74ACT273	77Kb / 11P	OCTAL D-TYPE FLIP FLOP WITH CLEAR
Fairchild Semiconductor	74ACT273	122Kb / 10P	Octal D-Type Flip-Flop
ON Semiconductor	74ACT273	111Kb / 8P	Octal D Flip?묯lop December, 2005 ??Rev. 6
Fairchild Semiconductor	74ACT273	383Kb / 12P	Octal D-Type Flip-Flop
STMicroelectronics	74ACT273B	77Kb / 11P	OCTAL D-TYPE FLIP FLOP WITH CLEAR

Manufacturer	Part #	Datasheet	Description
Texas Instruments	SN74ACT7814-40DL	525Kb / 16P	[Old version datasheet] 64 x 18 STROBED FIRST-IN, FIRST-OUT MEMORY
	SN74ALS234	206Kb / 11P	[Old version datasheet] 64 X 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
	SN74ALS235	275Kb / 15P	[Old version datasheet] 64 X 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
Advanced Micro Devices	C67401	450Kb / 9P	FIRST - IN FIRST - OUT (FIFO) 64 X 4, 64 X 5 CASCADABLE MEMORY
Texas Instruments	SN74ACT7813-40DLR	396Kb / 18P	[Old version datasheet] 64 x18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
List of Unclassifed Man...	TDC1030	226Kb / 14P	FIRST-IN FIRST-OUT MEMORY
Texas Instruments	SN74ALS236	174Kb / 11P	[Old version datasheet] 64 횞 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
	SN74ACT7813	194Kb / 14P	[Old version datasheet] 64 횞 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
	SN74ACT7813	231Kb / 16P	[Old version datasheet] 64 횞 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
	SN74ABT3611	368Kb / 26P	[Old version datasheet] 64 횞 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY